A new backoff algorithm for IEEE 802.11 distributed coordination function

Authors:
Taijun Li;Tiebin Tang;Cheng Chang
Affiliations:
College of Information Science and Technology, Hainan University, Haikou, Hainan Province, China;College of Information Science and Technology, Hainan University, Haikou, Hainan Province, China;College of Information Science and Technology, Hainan University, Haikou, Hainan Province, China
Venue:
FSKD'09 Proceedings of the 6th international conference on Fuzzy systems and knowledge discovery - Volume 3
Year:
2009

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Abstract

DCF (Distributed Coordination Function) of IEEE802.11 MAC protocols uses binary exponential increasing mechanism, called BEB (Binary Exponential Backoff) algorithm. Due to the lack of a mechanism evaluating the channel condition, it can not tune the value of contention windows adaptively, according to the actual network traffic. By introducing the network allocation vector count in routing protocol to approximate the intensity of surrounding traffic of nodes, the algorithm has been improved, so that the contention windows of backoff mechanism are adjusted reasonably according to the traffic of WLAN. Simulation experimenst are done and the results prove that the improved algorithm provides a better channel utilization and reduces the average transmission delay.